A disclosed mobile station includes a multiplexing portion that multiplexes a contention-based channel and a non-contention-base channel, and a transmitting portion that transmits the multiplexed contention-based and non-contention-based channels to a base station. In the mobile station, the contention-based channel and the non-contention-based channel are distinguished from whether scheduling is performed before transmission in the base station. The contention-based channel includes one or more of a fast access channel, a reservation channel, and a synchronization channel. The non-contention-based channel includes one or more of an uplink shared data channel and an uplink shared control channel. The fast access channel includes traffic data, or control data having a data size smaller than a predetermined size, or a combination thereof. The reservation channel includes information to request scheduling the non-contention-based channel. The uplink data channel includes the traffic data, or the control data, or a combination thereof.